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Sam Mulholland, of Parkers Fishery, in Warwickshire, said they had lost 150 fish since the outbreak in May. All have since been incinerated.

She said they would be shut for two weeks after the discovery by the government's Centre for Environment, Fisheries and Aquaculture Science (Cefas).

Mawgan Porth Pools and Lake

A spokeswoman for the inspectorate said it was a seasonal disease, especially when water temperatures were between 16 to 28C (60 to and 80F) but although temperatures had risen recently, there had not been the same number of cases as this time last year.